Bass’s Straits, and along the whole coasts of Australia, it probably occurs on the rocky shores of Tasmania. Native
of tropicid aud subtropical seas.
Gen. CVI. CERAMIUM, Roth.
(J. Ag. Sp. Alg. ii. p. 113. Harv. Phyc. Brit. t. 181, etc.)
1. Ceramium rubrum (Ag.; J . Ag. Sp. Alg. ii. p. 127; Kütz. Sp. Alg. p. 6 8 5 ; Harv. Phyc.
Brit. t. 181).—Conferva rubra, E. Bot. t. 1166.
H ab. On the larger and smaller Alga, commou.
D istr ib. Cosmopolitan.
2. Ceramium diapbanum (Roth; J. Ag. Sp. Alg. ii. p. 1 2 5 ; Ilarv. Phyc. Brit. t. 193).—Conf.
diaphana, Dillw. Conf. t. 3 8 ; E. Bot. t. 1742.
H ab. Georgetown, Gunn.
Dist r ib . Cosmopolitan.
3. Ceramium ramulosum (Hook. fil. et Harv. Lond. Journ. vi. p. 4 1 0 ; J . Ag. Sp. Alg. ii.
p. 1 2 1 ).
H ab. Georgetown, Gmn.
The Tasmanian specimens formerly referred to C. nodosum aud C. Deslongchampsii, seem rather to belong to
the present species, which is nearly related to the former.
4. Ceramium gracillimum (Kütz.; Harv. Phyc. Brit. t. 2 0 6 ; J . Ag. Sp. Alg. ii. p. 118).
H ab. Georgetown, on Zostera, etc., W. H. H.
D ist r ib . Europe. North America.
5. Ceramium puberulum (Sond.).—Cer. monile. Hook. fil. et Harv. Lond. Journ. vi. p . 410 ; J.
Ag. Sp. Alg. ii. p . 132. Celeceras monile, Kütz. Sp. Alg. p . 684.
H ab. Georgetown, common.
D ist b ib. Western Australia.
Gen. CVII. HALOPLEGMA, Mont.
(Mont. An. Sc. Nat. 1842. Endl. 3rd Suppl. p. 36. J. Ag. Sp. Alg. ii. p. 110.)
1. H a loplegm a P r e is sii (Sond. Alg. Preiss. p. 2 4 ; Kütz. Sp. Alg. 6 7 2 ; J . Ag. Sp. Alg. ii.
p. 111).—Rhodoplexia Preissii, Harv. in Hook. Ic. BI. t. 613.
Var. 0 . fiabelliforme ; fronde tenuiori latiori parum lobata Sabelliformi.
H ab. Mouth of the Tamar, not uncommon. Ehndera’ Island, Dr. Milligan. Var. 0 . In the Tamar,
above Georgetown, on rocky shores at low-water.
D ist r ib . West aud south coasts of Australia.
Our var. 0, whieh is common on shores, under Mr. Lawrence’s place, a short distance above Georgetown,
differs from the usual state of the species in being much thinner and more translucent, the lobes fewer and much
broader, and in the colour, which is more purple. The microscopic characters of the two plants are, however,
identical, aud various intermediate states occur towards tbe mouth of the River Tamar.
Gen. C V m . CROUANIA, / . Ag.
(J. Ag. Alg. Medit. p. 83. Endl. 3rd Suppl. p. 36. Ilarv. Phyc. Brit. t. 106. J. Ag. Sp. AJg. ii. p. 104.)
1. Crouania attenuata, var. australis (Harv, Alg. Austr, Exsic. n. 4 8 5 ; J . Ag. Sp. Alg. ii.
p. 105 ; Harv. Phyc. Brit. t. 106).
H ab. At Table Cape, Miss Mackenzie.
D istr ib. Native of Mediterranean, and coasts of Prance and England. Western Australia, at Ki.
ng
1, but closely
George’s Sound.
The specimens are ratlier coarser and less gelatinous than those from the south coast of
resemble some that we have received from the Mediterranean.
2. Crouania in sig n is (Harv.); fronde robusta elata (pedali et ultra) cartilaginea
mosissima, ramis alternis repetite alterne divisis ereberrime nodulosis, ramulis cylindraceis vestitis acutis vix
attenuatis.—7/anj. Alg. Exsic. Austr. n. 488.— (Tab. CXCIII. B.)
H ab. Georgetown, IF. H. H. Brown’s River, Gunn.
D ist iu b. South coast of New Holland.
Frond 12 or 14 inches long, more than half a line in diameter, tapering toward the apex, excessively
branched. Branches alternate, 8-10 inches long, erecto-patent, two or three times simüarly compounded, the ultimate
ramnli less than an inch in length. All the older parts of the frond are closely nodulose, the Uoris of
peripheric filaments being partially separated, though not so much so as to uncover the axial filament. The
smaller branches and ramuli are uniformly clothed with filaments, and therefore cj-lindrical. Tbe peripheric fila-
ments arc not gelatinous, thick, very much branched, the branching dichotomous and divaricate ; their apices are
blunt. Tetraspores triangularly divided, solitary on the ramuh. Favelta hidden among the rameUm of abortive
branchlets, formed out of a wliole or a half ramellus, reniform, containing very numerous spores. Colour a deep
brownish-red. Substance soft, but firm. It closely adheres to paper in d iy in g ,-P late CXCIII. B. Fig. 1, a
branch, the natural size; 2, apex of aramidus; 3. ramellus with a favella; 4, spores; 5, rameUus with tetraspores;
6, a tetraspore the latter figures
Gen. CIX. PTILOTA, Ag.
(Ag. Sp. Alg. i. p. 384. Endl. 3rd Suppl. p. 36. J. Ag. Sp. Alg. Ü. p. 92.)
1. P tilo ta a rticulata (J. Ag. Sp. Alg. ii. p. 100; Hook. fil. et Harv. Lond. Joum. ¡Ü. p. 409).
H ab. Georgetown, very common.
D istr ib . South coast of Australia.
2. PtÜota J eau n e r e ttü (Harv. Alg. Exsie. n. 479).—Thamnocarpus Ptilota, Hook. fil. et Harv.
Lond. Journ. vi. p . 409.
H ab. Port Arthur, Hr. Jeannerett. Eagle Hawkneck, J. H. H. Southport, C. Stuart.
D istrib. South coast of New Hollaud, H. Curdie, JF. H . H.
s. P tilo ta RhodocallU (Harv. Alg. Austr. Eisic. n. 4 7 8; Phvc. Austr. t. 44).— Rhoiocallis
elegans, Kutz. Sp. Alg. p . 670.
H ab. Southport, C. Stuart.
D istr ib. Coast of Yictoria, at Port Pairy.
A beautiful species, of a brilhaiit deep-red colour, which becomes a flaming scarlet in fresh-water. The general
habit resembles that of Pkacelocarpus Labillardieri.
Gen. CX. THAMNOCARPUS, Harv.
1. Thanmocarpos Gunnianus (Harv. in Hook. Ic. PI. t. 662 ; Lond. Joum. vi. p. 409).
I I ab. Port Arthur (?), Gunn (more probably at Circular Head). Southport, C. Sluart.
D istr ib . Also found, but without fruit, in Western Australia, IF. II. H.
We have no new facts to state respecting this curious and little-known plant, except that on Mr. Stuart’s
specimen wc find antheridia, similar to those of a Callithamnion, occupying the place of tetraspores.